Update list for Graphcat

Graphcat 6.40 changelog from May 29, 2016

Support added for WordPerfect X8, Windows 10

Graphcat 6.30 changelog from May 19, 2014

Support added for WordPerfect X6, Windows 8

Graphcat 6.20 changelog from June 15, 2012

Support added for WordPerfect X6, Windows 7

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